I hope you don't mind me answering, but both frenchies and I already clarified this point. Anyways to put it into clearer terms, as long as the person in questions says he is a Muslim, and follows Islam ie prays, fasts, etc and dosent deny homosexuality is a sin, then he is still a Muslim. And his sins are then for God to forgive or not. And God knows best.
However if he denies it being a sin, even when shown the proof from the Quran itself, and rejects the verses, then it is an act that can take one out of the fold of Islam ..
But again it's not upto us lay folk to claim so and so is a disbeliever when they say they are Muslims and follow Islam to the best of their ability.. This is takfeer which is a very dangerous ground to tread. Better just give the person the proof, and advice them whenvere possible,in the best way possible and also know when to back off. Much like we would do to anyone committing any of the major sins.
And I reapeat homosexuality is a major sin yes, but so is adultery, so is backbiting, so is slandering, lying, treacehery, etc.
Now as to the widespread of homosexuality and adultery being among the signs of the hour, yes they are, however there are many more signs that must occur too.These can take place over a long or short period of time,and until they all come to pass the hour will not come, and God knows best. This is to clarify Uranus's point.
I hope I explained things well enough.